package com.juc.pc;

/**
 *
 * 线程之间的通讯问题，生产者和消费者问题！  等待唤醒 通知唤醒
 * 线程简体执行 AB 操作同一个变量 num=0
 * A num+1
 * B num+1
 */
public class A {


    public static void main(String[] args) {
        Data data = new Data();
        new Thread(()->{
            for (int i = 0 ; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"A").start();

        new Thread(()->{
            for (int i = 0 ; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"B").start();


        new Thread(()->{
            for (int i = 0 ; i < 10; i++) {
                try {
                    data.increment();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"C").start();


        new Thread(()->{
            for (int i = 0 ; i < 10; i++) {
                try {
                    data.decrement();
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        },"D").start();
    }

}

//判断等待，业务，通知
class Data{ //数字资源

    private int number = 0;

    //+1
    public synchronized void increment() throws InterruptedException {
        while (number != 0){
            //等待
            this.wait();
        }
        number++;
        System.out.println(Thread.currentThread().getName() +"=>"+number);
        //通知其他线程，我+1完毕了
        this.notify();
    }

    //-1
    public synchronized void decrement() throws InterruptedException {
        while (number == 0){
            //等待
            this.wait();
        }
        number--;
        System.out.println(Thread.currentThread().getName() +"=>"+number);
        //通知其他线程，我+1完毕了
        this.notify();
    }

}